Why @[4:0] shows Mark Zuckerberg name on Facebook

Why @[4:0] shows Mark Zuckerberg name on Facebook

PC:  www.facebook.com Typing @ [4:0] will insert mark Zuckerberg name is a well known Facebook trick which can tag him anywhere on the website. This is a bug! Yes.In fact, I have also come across some images stating that if...
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